1 files changed, 200 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/EntityStore/DIHandlers/DIWikiPageHandler.php b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/EntityStore/DIHandlers/DIWikiPageHandler.php
new file mode 100644
index 00000000..dcad8b7f
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/SQLStore/EntityStore/DIHandlers/DIWikiPageHandler.php
@@ -0,0 +1,200 @@
+<?php
+
+namespace SMW\SQLStore\EntityStore\DIHandlers;
+
+use SMW\DIProperty;
+use SMW\DIWikiPage;
+use SMW\SQLStore\EntityStore\DataItemHandler;
+use SMW\SQLStore\EntityStore\Exception\DataItemHandlerException;
+use SMW\Exception\PredefinedPropertyLabelMismatchException;
+use SMW\SQLStore\TableBuilder\FieldType;
+use SMWDataItem as DataItem;
+
+/**
+ * DataItemHandler for dataitems of type DIWikiPage.
+ *
+ * This handler is slightly different from other handlers since wikipages are
+ * stored in a separate table and referred to by numeric IDs. The handler thus
+ * returns IDs in most cases, but expects data from the SMW IDs table (with
+ * DBkey, namespace, interwiki, subobjectname) to be given for creating new
+ * dataitems. The store recognizes this special behavior from the field type
+ * 'p' that the handler reports for its only data field.
+ *
+ * @license GNU GPL v2+
+ * @since 1.8
+ *
+ * @author Nischay Nahata
+ * @author Markus Kroetzsch
+ */
+class DIWikiPageHandler extends DataItemHandler {
+
+	/**
+	 * @since 1.8
+	 *
+	 * {@inheritDoc}
+	 */
+	public function getTableFields() {
+		return [ 'o_id' => FieldType::FIELD_ID ];
+	}
+
+	/**
+	 * @since 1.8
+	 *
+	 * {@inheritDoc}
+	 */
+	public function getFetchFields() {
+		return [ 'o_id' => FieldType::FIELD_ID ];
+	}
+
+	/**
+	 * @since 1.8
+	 *
+	 * {@inheritDoc}
+	 */
+	public function getTableIndexes() {
+		return [
+			'o_id',
+
+			// SMWSQLStore3Readers::getPropertySubjects
+			'p_id,s_id',
+
+			// SMWSQLStore3Readers::fetchSemanticData
+			// ... FROM `smw_fpt_sobj` INNER JOIN `smw_object_ids` AS o0 ON
+			// o_id=o0.smw_id WHERE s_id='104322'
+			's_id,o_id',
+
+			// SMWSQLStore3Readers::fetchSemanticData
+			// ... FROM `smw_di_wikipage` INNER JOIN `smw_object_ids` AS p ON
+			// p_id=p.smw_id INNER JOIN `smw_object_ids` AS o0 ON o_id=o0.smw_id
+			// WHERE s_id='104815'
+			's_id,p_id,o_id',
+
+			// QueryEngine::getInstanceQueryResult
+			// ... INNER JOIN `smw_fpt_inst` AS t3 ON t2.smw_id=t3.s_id WHERE
+			// (t2.smw_namespace='0' AND (t3.o_id='56')
+			'o_id,s_id',
+
+			// QueryEngine::getInstanceQueryResult
+			//'p_id,o_id,s_sort',
+
+			// SMWSQLStore3Readers::getPropertySubjects
+			// SELECT DISTINCT s_id FROM `smw_fpt_sobj` ORDER BY s_sort
+			//'s_sort,s_id',
+
+			// SELECT DISTINCT s_id FROM `smw_fpt_subp` WHERE o_id='96' ORDER BY s_sort
+			//'o_id,s_sort,s_id',
+
+			// In-property lookup
+			'o_id,p_id',
+			//'o_id,p_id,s_sort',
+
+			// SMWSQLStore3Readers::getPropertySubjects
+			// SELECT DISTINCT s_id FROM `smw_di_wikipage` WHERE (p_id='64' AND o_id='104') ORDER BY s_sort ASC
+			//'o_id,p_id,s_id,s_sort'
+		];
+	}
+
+	/**
+	 * @since 1.8
+	 *
+	 * {@inheritDoc}
+	 */
+	public function getWhereConds( DataItem $dataItem ) {
+
+		$oid = $this->store->getObjectIds()->getSMWPageID(
+			$dataItem->getDBkey(),
+			$dataItem->getNamespace(),
+			$dataItem->getInterwiki(),
+			$dataItem->getSubobjectName()
+		);
+
+		return [ 'o_id' => $oid ];
+	}
+
+	/**
+	 * @since 1.8
+	 *
+	 * {@inheritDoc}
+	 */
+	public function getInsertValues( DataItem $dataItem ) {
+
+		$oid = $this->store->getObjectIds()->makeSMWPageID(
+			$dataItem->getDBkey(),
+			$dataItem->getNamespace(),
+			$dataItem->getInterwiki(),
+			$dataItem->getSubobjectName()
+		);
+
+		return [ 'o_id' => $oid ];
+	}
+
+	/**
+	 * @since 1.8
+	 *
+	 * {@inheritDoc}
+	 */
+	public function getIndexField() {
+		return 'o_id';
+	}
+
+	/**
+	 * @since 1.8
+	 *
+	 * {@inheritDoc}
+	 */
+	public function getLabelField() {
+		return 'o_id';
+	}
+
+	/**
+	 * @since 1.8
+	 *
+	 * {@inheritDoc}
+	 */
+	public function dataItemFromDBKeys( $dbkeys ) {
+
+		if ( !is_array( $dbkeys ) || count( $dbkeys ) != 5 ) {
+			throw new DataItemHandlerException( 'Failed to create data item from DB keys.' );
+		}
+
+		$namespace = intval( $dbkeys[1] );
+
+		// Correctly interpret internal property keys
+		if ( $namespace == SMW_NS_PROPERTY && $dbkeys[0] != '' &&
+			$dbkeys[0]{0} == '_' && $dbkeys[2] == '' ) {
+
+			try {
+				$property = new DIProperty( $dbkeys[0] );
+			} catch( PredefinedPropertyLabelMismatchException $e ) {
+				// Most likely an outdated, no longer existing predefined
+				// property, mark it as outdate
+				$dbkeys[2] = SMW_SQL3_SMWIW_OUTDATED;
+
+				return $this->newDiWikiPage( $dbkeys );
+			}
+
+			$wikipage = $property->getCanonicalDiWikiPage( $dbkeys[4] );
+
+			if ( !is_null( $wikipage ) ) {
+				return $wikipage;
+			}
+		}
+
+		return $this->newDiWikiPage( $dbkeys );
+	}
+
+	private function newDiWikiPage( $dbkeys ) {
+
+		$diWikiPage = new DIWikiPage(
+			$dbkeys[0],
+			intval( $dbkeys[1] ),
+			$dbkeys[2],
+			$dbkeys[4]
+		);
+
+		$diWikiPage->setSortKey( $dbkeys[3] );
+
+		return $diWikiPage;
+	}
+
+}